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US4821069A - Apparatus for controlling the temperature of a heat roller - Google Patents

Apparatus for controlling the temperature of a heat roller Download PDF

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Publication number
US4821069A
US4821069A US06/919,456 US91945686A US4821069A US 4821069 A US4821069 A US 4821069A US 91945686 A US91945686 A US 91945686A US 4821069 A US4821069 A US 4821069A
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US
United States
Prior art keywords
signal
heat roller
thermal sensor
temperature
setting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/919,456
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English (en)
Inventor
Keizi Kusumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minolta Co Ltd
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Minolta Co Ltd
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Filing date
Publication date
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Assigned to MINOLTA CAMERA KABUSHIKI KAISHA reassignment MINOLTA CAMERA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KUSUMOTO, KEIZI
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Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1917—Control of temperature characterised by the use of electric means using digital means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/27—Control of temperature characterised by the use of electric means with sensing element responsive to radiation

Definitions

  • the present invention relates to an apparatus for controlling the temperature of a heat roller used in an electrophotographic copying machine or the like for thermally fixing toner on copying paper, and the invention particularly relates to processing of signals for a pyroelectric infrared thermal sensor used for the measurement of the heat roller temperature.
  • a heat roller is used for fixing the image of toner formed on copying paper by exerting heat and pressure on the paper.
  • the heat roller must have its surface temperature controlled within a certain range.
  • the pyroelectric sensor operates to detect in the form of a voltage signal or the like the temperature variation of a heat source object in response to a change in the spontaneous polarization of a pyroelectric member caused by the incident infrared rays from the heat source object under measurement.
  • the sensor voltage output is theoretically given as follows.
  • V denotes the sensor output voltage
  • W denotes the infrared radiation energy emitted from an object
  • T denotes the absolute temperature of the object
  • K 1 and K 2 are constants.
  • the pyroelectric sensor is operative to detect a somewhat sharp temperature variation (a temperature change caused by the incident infrared rays). Accordingly, it provides a zero output against a constant incident of the infrared rays.
  • a chopper mechanism is employed to interrupt the incident infrared rays, thereby creating a sharp temperature variation.
  • the output of the pyroelectric sensor represents a relative temperature (or temperature difference) between the temperature of a heat source object under measurement and the chopper mechanism periphery temperature, or more preferably the pyroelectric sensor periphery temperature, (will be termed "chopper temperature” hereinafter).
  • the sensor output voltage is theoretically given as follows.
  • T 1 denotes the temperature of the object under measurement
  • T 0 denotes the chopper temperature
  • the chopper temperature is measured and it is added to the relative temperature detected by the pyroelectric sensor.
  • FIG. 8 is a graph showing the result of heat roller temperature control, on which are plotted the actual temperature of the heat roller surface (solid line) and the apparent temperature of the heat roller surface (dashed line) obtained by summing the output of the pyroelectric sensor and the reference temperature (chopper temperature) measuring diode sensor (both outputs are also shown separtely). The actual temperature was measured by independent means.
  • the output of the pyroelectric sensor is proportional to the fourth power of the heat roller surface temperature subtracted by the fourth power of the chopper temperature.
  • the pyroelectric sensor output is not linearly proportional to the difference of temperature of the heat roller surface and in the chopper periphery, and the conflict is particularly significant in the region of larger temperature difference.
  • the heat roller surface temperature detected as a composite signal derived from the pyroelectric sensor output and diode sensor output is higher than the actual temperature. Therefore, the power switching control for the heater based on the composite signal will result in a heat roller surface temperature lower than the predetermined temperature, and a faulty fixing of toner will result.
  • the present invention is intended to cope with the foregoing situation of prior art, and its prime object is to provide a temperature control apparatus for a copying machine heat roller capable of satisfactory toner fixing even in the operating condition of a greater temperature difference between the heat roller and the periphery of the chopper.
  • An apparatus for controlling the temperature of a heat roller of the present invention comprises an infrared thermal sensor unit disposed in close vicinity to the heat roller and including a pyroelectric infrared thermal sensor, a chopper mechanism and a reference thermal sensor; signal composing means which composes electrical signals produced from the pyroelectric thermal sensor and the reference thermal sensor; setting signal generating means which produces a signal representing setting temperature of the heat roller; comparing means which compares the setting signal provided by the setting signal generating means with the output signal of the signal composing means; control means which controls power supply to a heater of the heat roller in response to the output signal of the comparing means; and setting signal shift means which causes the setting signal from the setting signal generating means to shift during a period after power of the apparatus has been turned on until the output of the reference thermal sensor settles.
  • This apparatus for controlling the temperature of the heat roller can effectively prevent a fall in the roller surface temperature (particularly a temperature fall at the end of the warming up of the heat roller) which is caused by the output characteristics of the pyroelectric sensor when there is a great difference between the heat roller surface temperature and the chopper periphery temperature.
  • the stability of heat roller temperature control is not impaired by the variation of the chopper periphery temperature.
  • FIG. 1 is a schematic diagram showing the thermal sensor unit incorporating a pyroelectric sensor, a chopper mechanism and a reference thermal sensor;
  • FIG. 2 is a schematic diagram showing the disposition of the thermal sensor unit in the periphery of the heat roller
  • FIG. 3 is a graph showing the output signals of the pyroelectric sensor, diode thermal sensor and their composite signal. All signals are in the form of voltage, and they are plotted against the temperature in the periphery of the chopper;
  • FIG. 4 is a block diagram showing an embodiment of this invention.
  • FIG. 5 is a flowchart showing the overall control for controlling a copying machine to which this invention is applied;
  • FIG. 6 is a flowchart showing the subroutine of heat roller temperature control
  • FIG. 7 is a flowchart showing the subroutine of heat roller temperature control in which the correction value for the setting roller temperature is varied progressively;
  • FIG. 8 is a graph showing the actual heat roller surface temperature and the apparent roller temperature derived from the outputs of the pyroelectric sensor and reference diode thermal sensor.
  • FIG. 9 is a flowchart showing the heat roller temperature control in which the setting temperature corrective operation takes place only in a certain time length.
  • the pyroelectric sensor of the conventional type may be used for detecting the temperature difference between the heat roller surface and the periphery of the sensor.
  • the reference thermal sensor for detecting the temperature in the periphery of the pyroelectric sensor may be of the type of diode sensor or thermoresistor.
  • the signal composing means for composing voltage signals produced from the two sensors to produce a temperature signal indicating the heat roller surface temperature may be arranged on a hardware basis or on a software basis using a microcomputer.
  • the setting signal generating means produces a signal representing a predetermined setting temperature of the heat roller, and the signal is compared with the output signal of the composing means by the control means so that heating by the heater is controlled in accordance with the comparison result.
  • the heater may be controlled by turning on and off a power supply.
  • the setting temperature (i.e., the magnitude of the setting signal) can be shifted in response to the previous composed signal and the signal from the reference thermal sensor.
  • the purpose is to correct the above-mentioned error (more strictly, compensation for the controlled temperature lowering caused by the error) which arises at a larger temperature difference between the heat roller surface and the periphery of the pyroelectric sensor.
  • the setting temperature is raised so as to increase the heat generation by the heater, thereby preventing the controlled temperature from falling below the predetermined temperature.
  • the setting temperature may be lowered progressively as time passes to reflect the time since the magnitude of the signal from the reference thermal sensor has reached a predetermined value, so that finer control is accomplished.
  • FIG. 1 is a schematic diagram of the thermal sensor unit incorporating a pyroelectric sensor and a reference thermal sensor
  • FIG. 2 is a schematic diagram showing the thermal sensor unit in the periphery of the heat roller.
  • the sensor unit 1 incorporates a pyroelectric sensor 23 and a reference temperature measuring diode thermal sensor 25 for measuring the reference temperature in the periphery of the chopper, both mounted on a printed wiring board which is fixed to an intermediate plate 21 enclosed within a metallic case 31.
  • a chopper disc 29 having a semicircular cut is fixed on the shaft of a stepping motor 27 so that the disc 29 conducts and interrupts the infrared rays alternately through the opening 33 into the pyroelectric sensor 23.
  • the sensor unit 1 is mounted on a heat roller cover 2 through a thermal insulator 9 so that it is adjacent the upper section of an upper heat roller 4
  • the upper heat roller 4 incorporates a heater lamp (halogen lamp) 5 as a heat source of the heat roller.
  • the upper heat roller 4 is geared so that it rotates in the direction indicated by the arrow A.
  • a lower heat roller 6 is in press-contact with the upper roller 4, and it is rotated by the upper heat roller 4 in the direction indicated by the arrow B.
  • a copying paper with an image of toner formed on it is transported by a conveyor section 7, and it is press-heated by the upper and lower heat rollers 4 and 6 so that toner is fixed on the copying paper. Then, the copying paper is sent out of the copying machine by a discharge roller 8.
  • FIG. 3 shows the output signal of the pyroelectric sensor 23, the output signal of the diode sensor 25 and their composite signal. All signals are in the form of voltage, and they are plotted against the temperature in the periphery of the chopper 29.
  • the temperature of the heat roller surface measured as the composite signal is higher than the actual temperature, as compared with the case of a smaller temperature difference between the heat roller surface and chopper periphery (in the region of chopper periphery temperature around 50 ⁇ 100° C.).
  • the output of the pyroelectric sensor 23 is given as a difference of the fourth power of the heat roller surface temperature and the fourth power of the chopper periphery temperature, as mentioned previously.
  • FIG. 4 shows the explanatory drawing of this embodiment.
  • the apparatus comprises an infrared sensor unit 1, a circuit 35 for processing the input and output signals of the sensor unit 1, a signal-chip microcomputer 40, an upper heat roller 4 incorporating a heater lamp 5, and a heater lamp drive circuit.
  • the signal processing circuit 35 consists of a circuit 36 for processing the output signal of the pyroelectric sensor 23, a circuit 38 for processing the output signal of the diode thermal sensor 25, and a circuit 39 for driving a stepping motor 27.
  • the circuit 36 amplifies the voltage signal provided by the pyroelectric sensor 23, holds the peak of the signal, and delivers it to the analog input port AN1 of the microcomputer 40.
  • the circuit 38 amplifies the voltage signal provided by the diode thermal sensor 25, and delivers it to the analog input port AN.0. of the microcomputer 40.
  • the circuits 36 and 38 have their amplifier gains adjusted so that they produce consistent voltage levels for both temperature levels.
  • the circuit 39 drives the stepping motor 27 in response to the drive signal provided by the microcomputer 40 at its output port PA1.
  • the microcomputer 40 incorporates an A/D converter, and has a linkage with another microcomputer for controlling other sections of the copying machine through bus lines.
  • the heater lamp drive circuit consists of a solid-state relay 51 for turning on and off the heater lamp and a driver 53 for driving the solid-state relay.
  • the driver 53 operates in response to the signal provided by the microcomputer 40 at its output port PA.0..
  • FIG. 5 shows in flowchart the overall control of the copying machine implemented by the microcomputer.
  • the microcomputer starts processing when power is turned on, and it first sets up the initial conditions such as flags and RAM contents. Then, the microcomputer enters the loop of operations including the command and data transaction or communication (S102), the heater temperature control according to this invention (S104), and other operations such as numeric display and paper transmission (S106). These cyclic operations are controlled by the internal timer.
  • the temperature control process for the heat roller is included in the control of the copying machine.
  • FIG. 6 shows in flowchart the subroutine of heat roller temperature control (step 104 in FIG. 5) implemented by the microcomputer 40.
  • the heat roller temperature the composite signal provided by the pyroelectric sensor and the diode sensor outputs
  • chopper temperature the diode sensor output signal
  • steps S202-S208 make a decision for the amount of correction for the heat roller temperature control.
  • the flag 1 is set (S202), and it is judged whether the detected heat roller temperature is above T 1 ° C. (S204), more strictly, it is judged whether the composite signal level is higher than the voltage level indicative of T 1 ° C.
  • a correction value X 1 is set to RESERV and a correction time t 1 is set to TIME (S214 and S216). These correction values are in a relationship of X 2 >X 1 and t 2 >t 1 . If, on the other hand, the chopper periphery temperature detected is above 50° C., indicating a little temperature difference between the chopper periphery temperature and the heat roller temperature, no correcting operation takes place (S218 and S220). Namely, the lower the chopper periphery temperature, the greater the temperature difference between the chopper periphery temperature and the roller surface temperature, therefore the larger correction value is applied to the setting temperature level.
  • Steps S222-S228 are the routine for controlling the heater lamp 5 incorporated in the heat roller 4.
  • T 2 ° C. is the predetermined temperature of the heat roller surface, and it is higher than T 1 ° C.
  • the output port PA.0. is made "1" so that the heater lamp is deenergized (S224). If the heat roller temperature is equal to the summed value, the output port PA.0. is left unchanged (S226). If the heat roller temperature is lower than the summed value, the output port PA.0. is made ".0.” so that the heater lamp is energized (S228).
  • the heater lamp is turned on or off depending on the detected heat roller surface temperature as against the setting temperature, thereby maintaining the roller surface temperature within a range of the predetermined periphery temperature.
  • the error inherent to the characteristics of the pyroelectric sensor is corrected by shifting the comparison level, whereby finer temperature control is accomplished.
  • this embodiment includes a following subroutine reflecting the time factor so as to perform finer control.
  • the subroutine is shown in FIG. 7. Initially, it is judged whether the correction time address (TIME) is ".0.” (zero correction) (S300), and if it is found zero, the timer is not started and no correction takes place for the heat roller temperature control. If the correction time address (TIME) content is not ".0.”, it is decremented (S302).
  • the ".0.” is set to TIME (S304 and S306). If the RESERV content is not “.0.”, it is subtracted by a certain value Z each time the TIME is decremented (S308). These operations are repeated until the RESERV content becomes zero (S310 and S312).
  • the above timer processing subroutine is run in each cycle of the main routine.
  • the chopper periphery temperature is compared with 40° C. and 50° C.
  • the present invention is not confined to this scheme, and the chopper periphery temperature may be compared with more than two levels of temperature.
  • the present invention is not confined to this scheme, but instead correction may be implemented for a certain time length (t 1 or t 2 ), with the corrective operating being removed thereafter, as shown in the flowchart of FIG. 9.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Temperature (AREA)
  • Fixing For Electrophotography (AREA)
  • Control Of Resistance Heating (AREA)
US06/919,456 1985-10-29 1986-10-16 Apparatus for controlling the temperature of a heat roller Expired - Lifetime US4821069A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60-242322 1985-10-29
JP60242322A JPS62102267A (ja) 1985-10-29 1985-10-29 ヒ−トロ−ラの温度制御装置

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US4821069A true US4821069A (en) 1989-04-11

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US06/919,456 Expired - Lifetime US4821069A (en) 1985-10-29 1986-10-16 Apparatus for controlling the temperature of a heat roller

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US (1) US4821069A (de)
JP (1) JPS62102267A (de)
DE (1) DE3636119A1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241349A (en) * 1991-03-12 1993-08-31 Casio Computer Co., Ltd. Image forming apparatus having a plurality of control modes of thermal fixing apparatus
US5274423A (en) * 1988-04-08 1993-12-28 Minolta Camera Kabushiki Kaisha Image forming apparatus having temperature control at a fixing unit
US5329342A (en) * 1988-02-29 1994-07-12 Canon Kabushiki Kaisha Image fixing apparatus
US5444521A (en) * 1991-07-15 1995-08-22 Canon Kabushiki Kaisha Image fixing device capable of controlling heating overshoot
US5819136A (en) * 1996-04-09 1998-10-06 Ricoh Company, Ltd. Temperature control for a fixing device
US20030202826A1 (en) * 2002-04-30 2003-10-30 Brother Kogyo Kabushiki Kaisha Fixing device and image forming device provided with the same
US6684037B2 (en) * 2001-06-07 2004-01-27 Canon Kabushiki Kaisha Fixing apparatus and image forming apparatus provided with fixing apparatus
US20060153275A1 (en) * 2002-07-15 2006-07-13 Chuji Ishikawa Temperature detecting unit and fixing apparatus
US20120248089A1 (en) * 2011-03-31 2012-10-04 Dong Liu Control device for heat roller
EP2573625A3 (de) * 2011-09-20 2015-07-08 Samsung Electronics Co., Ltd. Fixierschutzvorrichtung und Bilderzeugungsvorrichtung damit
US20170090364A1 (en) * 2015-09-25 2017-03-30 Kyocera Document Solutions Inc. Fixing device and image forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19643610C2 (de) * 1996-10-22 1999-06-17 Oce Printing Systems Gmbh Wärmefühleranordnung zum berührungsfreien Überwachen der Oberflächentemperatur einer Fixierwalze einer elektrofotografischen Druck- oder Kopiereinrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001545A (en) * 1974-06-15 1977-01-04 Minolta Camera Kabushiki Kaisha Devices for controlling the heating of fuser roll apparatus
US4318612A (en) * 1980-07-10 1982-03-09 International Business Machines Corporation Hot roll fuser temperature control
DE3330407A1 (de) * 1982-08-23 1984-02-23 Canon K.K., Tokyo Temperatursteuervorrichtung
US4493984A (en) * 1982-02-08 1985-01-15 Hitachi, Ltd. Temperature control device for fixing heat source of copying machine
US4556779A (en) * 1982-03-18 1985-12-03 Minolta Camera Kabushiki Kaisha Temperature control arrangement for heat roller

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58202471A (ja) * 1982-05-20 1983-11-25 Minolta Camera Co Ltd ヒ−トロ−ラの温度制御装置
JPS58160972A (ja) * 1982-03-18 1983-09-24 Minolta Camera Co Ltd ヒ−トロ−ラの温度制御装置
JPS58203476A (ja) * 1982-05-21 1983-11-26 Minolta Camera Co Ltd ヒ−トロ−ラの温度制御装置
JPS5952271A (ja) * 1982-09-20 1984-03-26 Minolta Camera Co Ltd ヒ−トロ−ラの温度制御装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001545A (en) * 1974-06-15 1977-01-04 Minolta Camera Kabushiki Kaisha Devices for controlling the heating of fuser roll apparatus
US4318612A (en) * 1980-07-10 1982-03-09 International Business Machines Corporation Hot roll fuser temperature control
US4493984A (en) * 1982-02-08 1985-01-15 Hitachi, Ltd. Temperature control device for fixing heat source of copying machine
US4556779A (en) * 1982-03-18 1985-12-03 Minolta Camera Kabushiki Kaisha Temperature control arrangement for heat roller
DE3330407A1 (de) * 1982-08-23 1984-02-23 Canon K.K., Tokyo Temperatursteuervorrichtung
US4603245A (en) * 1982-08-23 1986-07-29 Canon Kabushiki Kaisha Temperature control apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329342A (en) * 1988-02-29 1994-07-12 Canon Kabushiki Kaisha Image fixing apparatus
US5274423A (en) * 1988-04-08 1993-12-28 Minolta Camera Kabushiki Kaisha Image forming apparatus having temperature control at a fixing unit
US5241349A (en) * 1991-03-12 1993-08-31 Casio Computer Co., Ltd. Image forming apparatus having a plurality of control modes of thermal fixing apparatus
US5444521A (en) * 1991-07-15 1995-08-22 Canon Kabushiki Kaisha Image fixing device capable of controlling heating overshoot
US5819136A (en) * 1996-04-09 1998-10-06 Ricoh Company, Ltd. Temperature control for a fixing device
US6684037B2 (en) * 2001-06-07 2004-01-27 Canon Kabushiki Kaisha Fixing apparatus and image forming apparatus provided with fixing apparatus
US20050031387A1 (en) * 2002-04-30 2005-02-10 Brother Kogyo Kabushiki Kaisha Fixing device and image forming device provided with the same
US6795680B2 (en) * 2002-04-30 2004-09-21 Brother Kogyo Kabushiki Kaisha Fixing device and image forming device provided with the same
US20030202826A1 (en) * 2002-04-30 2003-10-30 Brother Kogyo Kabushiki Kaisha Fixing device and image forming device provided with the same
US7133636B2 (en) 2002-04-30 2006-11-07 Brother Kogyo Kabushiki Kaisha Fixing device and image forming device provided with the same
US20060153275A1 (en) * 2002-07-15 2006-07-13 Chuji Ishikawa Temperature detecting unit and fixing apparatus
US7363859B2 (en) * 2002-07-15 2008-04-29 Ricoh Company, Ltd. Temperature detecting unit with fixing apparatus
US20120248089A1 (en) * 2011-03-31 2012-10-04 Dong Liu Control device for heat roller
US8963055B2 (en) * 2011-03-31 2015-02-24 Ricoh Company, Ltd. Control device for heat roller
EP2573625A3 (de) * 2011-09-20 2015-07-08 Samsung Electronics Co., Ltd. Fixierschutzvorrichtung und Bilderzeugungsvorrichtung damit
US20170090364A1 (en) * 2015-09-25 2017-03-30 Kyocera Document Solutions Inc. Fixing device and image forming apparatus
CN106814569A (zh) * 2015-09-25 2017-06-09 京瓷办公信息系统株式会社 定影装置以及图像形成装置
US9817344B2 (en) * 2015-09-25 2017-11-14 Kyocera Document Solutions Inc. Fixing device capable of sensing temperature of heating body outside frame surrounding heating body regardless of moving frame and image forming apparatus including this fixing device
CN106814569B (zh) * 2015-09-25 2019-10-18 京瓷办公信息系统株式会社 定影装置以及图像形成装置

Also Published As

Publication number Publication date
JPS62102267A (ja) 1987-05-12
DE3636119C2 (de) 1991-09-26
DE3636119A1 (de) 1987-04-30

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